hixie: Try to provide more guidance. (whatwg r6972)
http://dev.w3.org/cvsweb/html5/spec/Overview.html?r1=1.5566&r2=1.5567&f=hhttp://html5.org/tools/web-apps-tracker?from=6971&to=6972
===================================================================
RCS file: /sources/public/html5/spec/Overview.html,v
retrieving revision 1.5566
retrieving revision 1.5567
diff -u -d -r1.5566 -r1.5567
--- Overview.html 7 Feb 2012 00:22:59 -0000 1.5566
+++ Overview.html 7 Feb 2012 00:36:49 -0000 1.5567
@@ -19961,7 +19961,9 @@
<em>title</em>, or <em>legend</em>. It is supposed to contain
replacement text that could be used by users <em>instead</em> of the
image; it is not meant to supplement the image. The <code title="attr-title"><a href="#the-title-attribute">title</a></code> attribute can be used for
- supplemental information.<p class="note">One way to think of alternative text is to think
+ supplemental information.<p>Another corollary is that the <code title="attr-img-alt"><a href="#attr-img-alt">alt</a></code> attribute's value should not repeat
+ information that is already provided in the prose next to the
+ image.<p class="note">One way to think of alternative text is to think
about how you would read the page containing the image to someone
over the phone, without mentioning that there is an image
present. Whatever you say instead of the image is typically a good